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Subject: [OMPI devel] 1.6.2rc2: opal_path_nfs failure for "bind" mount
From: Paul Hargrove (phhargrove_at_[hidden])
Date: 2012-09-11 15:34:19


In testing 1.6.2rc2 on a BG/Q front-end I've encountered the following
failure from "make check":

 Failure : Mismatch: input "/soft", expected:0 got:1
> SUPPORT: OMPI Test failed: opal_path_nfs() (1 of 20 failed)
> FAIL: opal_path_nfs

What I find digging deeper is that the mount of /soft is a bit unusual (at
least to me):

$ grep /soft /etc/fstab
> /gpfs/vesta_scratch/software /soft none _netdev,bind 0 0
> $ mount | grep /soft
> /gpfs/vesta_scratch/software on /soft type none (rw,bind,_netdev)
> $ grep /soft /proc/mounts
> /dev/vesta_scratch /soft gpfs rw,relatime 0 0

Looking into the mount man page I find that the "_netdev" is NOT a problem,
just an keyword used to identify mounts that require network access to
implement " -O no_netdev" in mount.
The "problem" that opal_path_nfs is encountering is that this is a "bind"
mount which makes an already mounted fs (or subtree of one) available at a
second location.

If I am understanding "expected:0 got:1" correctly this failure shows that
the TEST is getting this case (bind-mount of GPFS fs) incorrect.
So, this is a BENIGN failure, but distracting (and preventing "make check"
from completing).

-Paul

-- 
Paul H. Hargrove                          PHHargrove_at_[hidden]
Future Technologies Group
Computer and Data Sciences Department     Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900